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Motorola CPS/XTS Control Channel Bandwidth

Rlahey

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Narrowband transmit deviation is 2.5khz. In Moto CPS for control channels when you change the bandwidth to 12.5khz, it makes your tx deviation 5khz, so to achieve the 2.5khz narrowband channel deviation you need to select 6.25khz.

Why is that? I'm sure there is some math I'm not understanding...
 

ramal121

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That is correct. You are cutting the channel bandwidth in half. Don't do that. Wideband is 25 khz (or 20 kHz) and narrowband is 12.5 kHz. Period.

Now for deviation we only reference half of what is actually occupied on the channel. FM modulation occurs above AND below the carrier frequency. The maximum deviation allowed applies to both directions. So 5 kHz means plus or minus 5 khz or a total of 10 kHz of real estate. Same with narrow band, plus or minus 2.5 kHz for a total of 5 kHz.

Therefore a 25 kHz bandwidth channel uses +/- 5 kHz deviation and a 12.5 kHz channel uses +/- 2.5 kHz deviation. And that's the way it is.
 

wa8pyr

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Apart from VHF and UHF, narrowband only applies on 700 MHz.
 
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